US20070031978A1 - Diagnostic device - Google Patents
Diagnostic device Download PDFInfo
- Publication number
- US20070031978A1 US20070031978A1 US11/424,669 US42466906A US2007031978A1 US 20070031978 A1 US20070031978 A1 US 20070031978A1 US 42466906 A US42466906 A US 42466906A US 2007031978 A1 US2007031978 A1 US 2007031978A1
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- US
- United States
- Prior art keywords
- sample
- diagnostic device
- porous substrate
- filter
- container
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/50—Containers for the purpose of retaining a material to be analysed, e.g. test tubes
- B01L3/502—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures
- B01L3/5023—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures with a sample being transported to, and subsequently stored in an absorbent for analysis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/52—Use of compounds or compositions for colorimetric, spectrophotometric or fluorometric investigation, e.g. use of reagent paper and including single- and multilayer analytical elements
- G01N33/521—Single-layer analytical elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
- G01N33/54366—Apparatus specially adapted for solid-phase testing
- G01N33/54386—Analytical elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
- G01N33/54366—Apparatus specially adapted for solid-phase testing
- G01N33/54386—Analytical elements
- G01N33/54387—Immunochromatographic test strips
- G01N33/54388—Immunochromatographic test strips based on lateral flow
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/558—Immunoassay; Biospecific binding assay; Materials therefor using diffusion or migration of antigen or antibody
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/06—Auxiliary integrated devices, integrated components
- B01L2300/0681—Filter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/08—Geometry, shape and general structure
- B01L2300/0809—Geometry, shape and general structure rectangular shaped
- B01L2300/0825—Test strips
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L9/00—Supporting devices; Holding devices
- B01L9/52—Supports specially adapted for flat sample carriers, e.g. for plates, slides, chips
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S435/00—Chemistry: molecular biology and microbiology
- Y10S435/97—Test strip or test slide
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S435/00—Chemistry: molecular biology and microbiology
- Y10S435/971—Capture of complex after antigen-antibody reaction
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S436/00—Chemistry: analytical and immunological testing
- Y10S436/807—Apparatus included in process claim, e.g. physical support structures
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S436/00—Chemistry: analytical and immunological testing
- Y10S436/807—Apparatus included in process claim, e.g. physical support structures
- Y10S436/81—Tube, bottle, or dipstick
Definitions
- the present invention relates to a diagnostic device and a method of performing an analysis.
- Embodiments of the present invention disclose a diagnostic device that enables direct immunochromatographic analysis of a sample with a high solids content.
- Immunochromatographic assays also called lateral flow tests or strip tests have been used for several decades. They are an extension of the technology used in latex agglutination tests. Essentially any liquid that can be bound to a visually detectable solid support can be tested for qualitatively. Typical tests involve providing a sample to be tested for a particular ligand at one end of a strip formed from a porous substrate. The sample moves along the strip by capillary action reaching a portion of the strip containing a visually detectable solid support such as a colloidal gold/antibody conjugate which is arranged to bind to the ligand being tested for.
- a visually detectable solid support such as a colloidal gold/antibody conjugate which is arranged to bind to the ligand being tested for.
- the ligand being tested for If the ligand being tested for is present, it binds to the visually detectable solid support and a second antibody, immobilised as a line in the strip, then captures the complex. If the test is positive, a coloured line develops. Results can usually be read in 10 to 20 minutes. Strip tests are suitable for home testing because of their user-friendly format and the short time required to obtain a test result. Some of the more common strip tests currently on the market are tests for pregnancy, strep throat and chlamydia.
- the present invention seeks to alleviate or overcome at least one of these problems.
- a diagnostic device for performing an immunochromatographic analysis of a sample comprising:
- porous substrate for a visually detectable indicator arranged to bind to a ligand or other material being tested for and a filter arranged to act on a sample being tested before at least a portion of the sample encounters the porous substrate.
- the filter enables the diagnostic device to work particularly well with samples that contain solid components as the filter collects the solid components enabling the fluid portion to progress to the porous substrate to be tested, without blocking it.
- the diagnostic device works particularly well with non-clear samples such as blood or urine as the filter removes at least some of the coloured particles providing a much clearer test result.
- the filter is preferably hydrophilic or the device has a hydrophilic portion to draw the sample through towards the porous substrate. This provides a more uniform sample flow and minimises the need for mechanical input.
- the device may have a container into which a sample may be provided and the container may be sealably connectable to the diagnostic device.
- the provision of a sample into a container may be more convenient than providing a sample onto the diagnostic device, and as the container is sealably connectable to the diagnostic device, there is a much reduced risk of contamination or soiling during analysis, handling and disposal.
- the provision of a container which is sealably connectable to the diagnostic device reduces the components to a single assembly minimising user confusion.
- the use of a container into which sample may be provided enables the sample to be pre-treated, such as by being mixed with appropriate reagants or a buffer or shaken.
- the entire diagnostic device may be encapsulated within a housing to prevent contact with or exposure to the sample.
- the container for holding the sample may attach and seal directly to the diagnostic device which preferably houses the filter in intimate contact with the porous substrate.
- the device may include a dosing portion arranged to receive up to a predetermined maximum volume of a sample from the filter.
- the dosing portion may be arranged to be moved out of contact with the filter and into contact with the porous substrate.
- a method of performing an analysis on a sample comprising:
- a porous substrate for a visually detectable indicator to bind to a ligand or other material being tested for, if present in the sample.
- FIG. 1 shows a schematic side view of a diagnostic device comprising a porous substrate with a filter
- FIG. 2 shows a schematic cross-sectional side view of another diagnostic device
- FIG. 3 shows a schematic cross-sectional side view of an encapsulated diagnostic device
- FIG. 4 shows a container to be used with the diagnostic device shown in FIG. 3 ;
- FIG. 5 shows an exploded perspective view of a further diagnostic device with an associated container
- FIG. 6 shows a cross-sectional side view of the diagnostic device of FIG. 5 when assembled and
- FIG. 7 shows an arrangement for providing a stoichometric volume of a sample.
- a diagnostic device 1 for performing an immunochromatographic analysis on a sample comprises a porous substrate 10 , in this example made from nitro-cellulose, with a visually detectable support 20 , in this example a colloidal gold/antibody conjugate, provided in the porous substrate 10 to be bound to a ligand or other material being tested for.
- a filter 30 is arranged to pre-filter a sample provided thereon as indicated by the arrow.
- the filter 30 is a non-woven pre-filter preferably made from a plastics material.
- the filter 30 collects solid components and/or at least some coloured particles from the sample such that the porous substrate 10 is not blocked and contains less coloured sample and so produces a more easily read result.
- solid components and/or coloured particles are collected in the filter 30 whilst fluid progresses along to the porous substrate 10 by capillary action, drawn by the absorbent cellulose 40 at the opposite end of the porous substrate 10 .
- the fluid component of the sample reaches the visually detectable support 20 . If the ligand or other material being tested for is present in the fluid component of the sample, the visually detectable support 20 binds to it.
- the fluid sample then continues to pass along the porous substrate 10 until it reaches a line 50 , in this example containing a second antibody, to capture the sample. If the sample contains the visually detectable support 20 as a complex, a coloured line develops indicating a positive test result.
- a second line 60 may be provided to indicate that the fluid sample has progressed as far as line 50 to confirm that the test has been satisfactorily performed, as is well known in the art.
- the filter 30 is preferably hydrophilic to make the sample flow more uniformly and to minimise the need for mechanical input.
- FIG. 2 shows a schematic cross-sectional side view of another embodiment of the present invention.
- the filter 30 extends into a receptacle 31 arranged to receive a sample being tested.
- the receptacle 31 provides for more convenient provision of a sample onto the filter 30 as the receptacle 31 has sidewalls 32 to contain a sample therein.
- FIG. 3 shows a schematic cross-sectional side view of another embodiment of the present invention.
- the porous substrate 10 is encapsulated within a sheath 70 with at least one transparent portion to view the result to prevent contact with or exposure to the sample whilst on the porous substrate 10 .
- the filter 30 is provided in this example within a receptacle 31 with means 33 for attachment to a sample preparation container 80 as shown in FIG. 4 in which a sample 81 may be provided.
- the sample 81 may have been mixed with suitable reagants or a buffer and shaken.
- the container 80 has a lid 82 to prevent contact with or exposure to the sample 81 .
- the container 80 has means 83 for attachment to the corresponding attachment means 33 of the diagnostic device shown in FIG. 3 .
- the attachment means 33 , 83 may be screw threads, push-fit attachments or any suitable attachment means.
- the attachment means 33 , 83 provide a sealable connection between the container 80 and the diagnostic device 1 providing a much reduced risk of contamination or soiling during analysis, handling and disposal. The provision of two components (the device 1 and container 80 ) which are sealably connectable minimises user confusion and error.
- the diagnostic device 1 and container 80 shown in FIGS. 3 and 4 are arranged to be attached together to form an in-line device.
- any suitable relative orientation of the diagnostic device 1 and container 80 may be provided, such as the off-set arrangement shown in the exploded perspective view of FIG. 5 .
- the container 80 is sealably connectable to the receptable 31 of the diagnostic device 1 using threads 83 on the container 80 and corresponding threads 33 in the receptacle 31 .
- the diagnostic device 1 encapsulates the porous substrate 10 with upper 71 and lower 72 portions of a sheath 70 .
- a transparent portion 73 is provided in the upper portion 71 of the sheath so that the result of the test on the porous substrate 10 may be viewed.
- the filter 30 is housed in the diagnostic device 1 such that it may be provided in intimate contact adjacent to the porous substrate 10 to pre-filter a sample from the container 80 .
- the lower portion 72 of the sheath includes mounting supports 74 for the porous substrate 10 to keep it in a stable position within the diagnostic device 1 .
- FIG. 6 shows a cross-sectional side view of the diagnostic device of FIG. 5 when assembled.
- the container 80 holding the sample attaches and seals directly to the main body of the diagnostic device 1 which houses the filter 30 in intimate contact with the porous substrate 10 being used as an immunochromatographic analysis strip.
- FIG. 7 shows an arrangement for providing a stoichometric volume of a sample to a porous substrate 10 . It is desirable for the porous substrate 10 not to be provided with an excessive volume of a sample as this could flood the substrate and impair the results. For example, for a typical diagnostic device, it is desirable not to exceed 10 ⁇ of a sample such as blood.
- the arrangement shown in FIG. 7 includes a dosing portion 100 arranged to receive up to a predetermined maximum volume of a sample from a filter 30 .
- the dosing portion 100 may be a frit of porous material.
- the filter 30 is composed of two sample filter layers 30 a, 30 b.
- step 1 of FIG. 7 the dosing portion 100 is shown in a first position in contact with the filter 30 but not in contact with the porous substrate 10 .
- a sample from a suitable dispensing device A is then applied to the filter 30 .
- the sample is seen to be absorbed into the filter 30 and dosing portion 100 .
- the dosing portion 100 is arranged to receive up to a predetermined maximum volume of a sample from the filter 30 , for example by being a predetermined size and having a predetermined porosity.
- the predetermined volume received by the dosing portion 100 is arranged to be suitable for the particular test being performed by the diagnostic device.
- step 3 of FIG. 7 the dosing portion 100 with a predetermined volume of a sample is moved out of contact with the filter 30 and into contact with the porous substrate 10 .
- the movement of the dosing portion may be achieved by any suitable means such as a suitable actuator on the diagnostic device.
- step 4 of FIG. 7 as the dosing portion 100 is now in contact with the porous substrate 10 , the predetermined volume of sample from the dosing portion 100 is drawn into the porous substrate 10 so that the diagnosis may be performed.
- a buffer may also be applied to the diagnostic device.
- the components of the diagnostic device may be made from any suitable materials such as combustible materials to enable disposal by incineration.
- the filter may be formed integrally with the porous strip or attached to it.
- the diagnostic device may for example be used with any immunochromatographic assay, lateral flow test or strip test.
Abstract
Description
- The present invention relates to a diagnostic device and a method of performing an analysis. Embodiments of the present invention disclose a diagnostic device that enables direct immunochromatographic analysis of a sample with a high solids content.
- Immunochromatographic assays, also called lateral flow tests or strip tests have been used for several decades. They are an extension of the technology used in latex agglutination tests. Essentially any liquid that can be bound to a visually detectable solid support can be tested for qualitatively. Typical tests involve providing a sample to be tested for a particular ligand at one end of a strip formed from a porous substrate. The sample moves along the strip by capillary action reaching a portion of the strip containing a visually detectable solid support such as a colloidal gold/antibody conjugate which is arranged to bind to the ligand being tested for. If the ligand being tested for is present, it binds to the visually detectable solid support and a second antibody, immobilised as a line in the strip, then captures the complex. If the test is positive, a coloured line develops. Results can usually be read in 10 to 20 minutes. Strip tests are suitable for home testing because of their user-friendly format and the short time required to obtain a test result. Some of the more common strip tests currently on the market are tests for pregnancy, strep throat and chlamydia.
- However, there are a number of problems associated with conventional strip tests. One problem is that it is difficult to use strip tests with samples that contain solid components, such as solublised faeces or samples containing suspended organic material, as the solid components tend to block the porous substrate of the strip preventing the sample from flowing along the strip. A further problem arises when trying to use a strip test with a non-clear sample such as blood or urine as the colour from the sample may obscure the coloured line indicating whether or not the test is positive so that the results cannot be clearly determined.
- The present invention seeks to alleviate or overcome at least one of these problems.
- According to a first aspect of the present invention there is provided a diagnostic device for performing an immunochromatographic analysis of a sample, the device comprising:
- a porous substrate for a visually detectable indicator arranged to bind to a ligand or other material being tested for and a filter arranged to act on a sample being tested before at least a portion of the sample encounters the porous substrate.
- The filter enables the diagnostic device to work particularly well with samples that contain solid components as the filter collects the solid components enabling the fluid portion to progress to the porous substrate to be tested, without blocking it. Similarly, the diagnostic device works particularly well with non-clear samples such as blood or urine as the filter removes at least some of the coloured particles providing a much clearer test result.
- The filter is preferably hydrophilic or the device has a hydrophilic portion to draw the sample through towards the porous substrate. This provides a more uniform sample flow and minimises the need for mechanical input.
- The device may have a container into which a sample may be provided and the container may be sealably connectable to the diagnostic device. The provision of a sample into a container may be more convenient than providing a sample onto the diagnostic device, and as the container is sealably connectable to the diagnostic device, there is a much reduced risk of contamination or soiling during analysis, handling and disposal. The provision of a container which is sealably connectable to the diagnostic device reduces the components to a single assembly minimising user confusion. Furthermore, the use of a container into which sample may be provided enables the sample to be pre-treated, such as by being mixed with appropriate reagants or a buffer or shaken.
- The entire diagnostic device may be encapsulated within a housing to prevent contact with or exposure to the sample.
- The container for holding the sample may attach and seal directly to the diagnostic device which preferably houses the filter in intimate contact with the porous substrate.
- The device may include a dosing portion arranged to receive up to a predetermined maximum volume of a sample from the filter. The dosing portion may be arranged to be moved out of contact with the filter and into contact with the porous substrate.
- According to a second aspect of the present invention there is provided a method of performing an analysis on a sample, the method comprising:
- filtering a sample to be tested and
- providing the filtered sample to a porous substrate for a visually detectable indicator to bind to a ligand or other material being tested for, if present in the sample.
- Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:
-
FIG. 1 shows a schematic side view of a diagnostic device comprising a porous substrate with a filter; -
FIG. 2 shows a schematic cross-sectional side view of another diagnostic device; -
FIG. 3 shows a schematic cross-sectional side view of an encapsulated diagnostic device; -
FIG. 4 shows a container to be used with the diagnostic device shown inFIG. 3 ; -
FIG. 5 shows an exploded perspective view of a further diagnostic device with an associated container; -
FIG. 6 shows a cross-sectional side view of the diagnostic device ofFIG. 5 when assembled andFIG. 7 shows an arrangement for providing a stoichometric volume of a sample. - As shown in
FIG. 1 , adiagnostic device 1 for performing an immunochromatographic analysis on a sample comprises aporous substrate 10, in this example made from nitro-cellulose, with a visuallydetectable support 20, in this example a colloidal gold/antibody conjugate, provided in theporous substrate 10 to be bound to a ligand or other material being tested for. Afilter 30 is arranged to pre-filter a sample provided thereon as indicated by the arrow. In this example thefilter 30 is a non-woven pre-filter preferably made from a plastics material. As explained, thefilter 30 collects solid components and/or at least some coloured particles from the sample such that theporous substrate 10 is not blocked and contains less coloured sample and so produces a more easily read result. - In use, after being provided on the
filter 30, solid components and/or coloured particles are collected in thefilter 30 whilst fluid progresses along to theporous substrate 10 by capillary action, drawn by theabsorbent cellulose 40 at the opposite end of theporous substrate 10. The fluid component of the sample reaches the visuallydetectable support 20. If the ligand or other material being tested for is present in the fluid component of the sample, the visuallydetectable support 20 binds to it. The fluid sample then continues to pass along theporous substrate 10 until it reaches aline 50, in this example containing a second antibody, to capture the sample. If the sample contains the visuallydetectable support 20 as a complex, a coloured line develops indicating a positive test result. If the ligand or other material being tested for is not present, it would not have become bound to thedetectable support 20 and a coloured line would not have developed atpoint 50. If desired, asecond line 60 may be provided to indicate that the fluid sample has progressed as far asline 50 to confirm that the test has been satisfactorily performed, as is well known in the art. - The
filter 30 is preferably hydrophilic to make the sample flow more uniformly and to minimise the need for mechanical input. -
FIG. 2 shows a schematic cross-sectional side view of another embodiment of the present invention. In this embodiment thefilter 30 extends into areceptacle 31 arranged to receive a sample being tested. Thereceptacle 31 provides for more convenient provision of a sample onto thefilter 30 as thereceptacle 31 hassidewalls 32 to contain a sample therein. -
FIG. 3 shows a schematic cross-sectional side view of another embodiment of the present invention. In this example theporous substrate 10 is encapsulated within asheath 70 with at least one transparent portion to view the result to prevent contact with or exposure to the sample whilst on theporous substrate 10. Thefilter 30 is provided in this example within areceptacle 31 withmeans 33 for attachment to asample preparation container 80 as shown inFIG. 4 in which asample 81 may be provided. Thesample 81 may have been mixed with suitable reagants or a buffer and shaken. Thecontainer 80 has alid 82 to prevent contact with or exposure to thesample 81. Use of aseparate container 80 enables a sample to be collected separately, for example by a person being tested, and then sealed with thelid 82 and taken to be tested with the diagnostic device. Thecontainer 80 has means 83 for attachment to the corresponding attachment means 33 of the diagnostic device shown inFIG. 3 . The attachment means 33, 83 may be screw threads, push-fit attachments or any suitable attachment means. The attachment means 33, 83 provide a sealable connection between thecontainer 80 and thediagnostic device 1 providing a much reduced risk of contamination or soiling during analysis, handling and disposal. The provision of two components (thedevice 1 and container 80) which are sealably connectable minimises user confusion and error. - The
diagnostic device 1 andcontainer 80 shown inFIGS. 3 and 4 are arranged to be attached together to form an in-line device. However, any suitable relative orientation of thediagnostic device 1 andcontainer 80 may be provided, such as the off-set arrangement shown in the exploded perspective view ofFIG. 5 . - As shown in
FIG. 5 , thecontainer 80 is sealably connectable to thereceptable 31 of thediagnostic device 1 usingthreads 83 on thecontainer 80 andcorresponding threads 33 in thereceptacle 31. Thediagnostic device 1 encapsulates theporous substrate 10 with upper 71 and lower 72 portions of asheath 70. Atransparent portion 73 is provided in theupper portion 71 of the sheath so that the result of the test on theporous substrate 10 may be viewed. Thefilter 30 is housed in thediagnostic device 1 such that it may be provided in intimate contact adjacent to theporous substrate 10 to pre-filter a sample from thecontainer 80. Thelower portion 72 of the sheath includes mountingsupports 74 for theporous substrate 10 to keep it in a stable position within thediagnostic device 1. -
FIG. 6 shows a cross-sectional side view of the diagnostic device ofFIG. 5 when assembled. As can be seen, thecontainer 80 holding the sample attaches and seals directly to the main body of thediagnostic device 1 which houses thefilter 30 in intimate contact with theporous substrate 10 being used as an immunochromatographic analysis strip. -
FIG. 7 shows an arrangement for providing a stoichometric volume of a sample to aporous substrate 10. It is desirable for theporous substrate 10 not to be provided with an excessive volume of a sample as this could flood the substrate and impair the results. For example, for a typical diagnostic device, it is desirable not to exceed 10μ of a sample such as blood. - The arrangement shown in
FIG. 7 includes adosing portion 100 arranged to receive up to a predetermined maximum volume of a sample from afilter 30. Thedosing portion 100 may be a frit of porous material. In the example shown inFIG. 7 thefilter 30 is composed of two sample filter layers 30 a, 30 b. - In
step 1 ofFIG. 7 , thedosing portion 100 is shown in a first position in contact with thefilter 30 but not in contact with theporous substrate 10. A sample from a suitable dispensing device A is then applied to thefilter 30. - In
step 2 ofFIG. 7 , the sample is seen to be absorbed into thefilter 30 anddosing portion 100. Thedosing portion 100 is arranged to receive up to a predetermined maximum volume of a sample from thefilter 30, for example by being a predetermined size and having a predetermined porosity. The predetermined volume received by thedosing portion 100 is arranged to be suitable for the particular test being performed by the diagnostic device. - In
step 3 ofFIG. 7 , thedosing portion 100 with a predetermined volume of a sample is moved out of contact with thefilter 30 and into contact with theporous substrate 10. The movement of the dosing portion may be achieved by any suitable means such as a suitable actuator on the diagnostic device. - In
step 4 ofFIG. 7 , as thedosing portion 100 is now in contact with theporous substrate 10, the predetermined volume of sample from thedosing portion 100 is drawn into theporous substrate 10 so that the diagnosis may be performed. In this example a buffer may also be applied to the diagnostic device. - As the
filter 30 is never in contact withporous substrate 10 in the example ofFIG. 7 , buffer and conjugate cannot be sucked up from the porous substrate into the sample delivery device A. - The components of the diagnostic device may be made from any suitable materials such as combustible materials to enable disposal by incineration.
- Many variations may be made to the examples described above. For example, the filter may be formed integrally with the porous strip or attached to it. The diagnostic device may for example be used with any immunochromatographic assay, lateral flow test or strip test.
Claims (11)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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GB0512323.7 | 2005-06-16 | ||
GB0512323A GB2427271A (en) | 2005-06-16 | 2005-06-16 | Diagnostic device |
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US20070031978A1 true US20070031978A1 (en) | 2007-02-08 |
US7354614B2 US7354614B2 (en) | 2008-04-08 |
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US11/424,669 Expired - Fee Related US7354614B2 (en) | 2005-06-16 | 2006-06-16 | Diagnostic device |
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US (1) | US7354614B2 (en) |
EP (1) | EP1736777A3 (en) |
GB (2) | GB2427271A (en) |
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Also Published As
Publication number | Publication date |
---|---|
GB2427272B (en) | 2009-11-18 |
GB2427272A (en) | 2006-12-20 |
EP1736777A2 (en) | 2006-12-27 |
GB2427271A (en) | 2006-12-20 |
GB0611582D0 (en) | 2006-07-19 |
GB0512323D0 (en) | 2005-07-27 |
US7354614B2 (en) | 2008-04-08 |
EP1736777A3 (en) | 2009-04-29 |
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